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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba0b5a90c63c5aa0843d1cc86fe6621dc46b1038094547476ba98c3487c74ca' 
  AND token = 'cYQDauAhPt81Aj4CtMCKAWAjCuygee7ORP7eVdyZZ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}