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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2a8a72b5a7896495eaa25a21847765340a5dd40ed5d9e8ea996aa2afdb9f31' 
  AND token = 'czqK+9av0vQxXZvgh3ktt9thstinIzTS6pTzAXFztf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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