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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b52b211b38a115f6bcf3beabe7a26e8bde3f999cdaa8fc3f0b04b41dd58add' 
  AND token = 'OocHJSx4709pJVAMbZfTpv6b07r68+82qOGgI8C5dWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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