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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0e440e49be709c187bae557642dc6a9df604c12a828596a8c209b1a1886d71' 
  AND token = '5pqQyUP2YmLVpfuV1RX5LMX3eD9t7TOIX6/LK5R4ubQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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