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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb34848d0d300c8027e24dc9c7cc656e8de683b7e1017d20d22300bec7508e1a' 
  AND token = 'j5g5ZcZLKLgCvYt1oRHcGKYiXkmwldrxpJfwNTOSvHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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