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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d3f18bcfac55396da0904d2c8cd8c9408a94e7f59e60c09fefeedfb2693b62' 
  AND token = 'dxtD8TkKezbnce7cSFpj/pPNKOhOZT/ZD4rWQQGUF1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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