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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66507a3c83672f084e5323b4aa5f7eed18ebfc0b91830dbba63e35e0842a6ca' 
  AND token = 'jsNvcUIBdhI+dJKyfad2S7mP9onya6SZMUbAdE65dCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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