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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbf6f3c0125f76bd7e7fd326ae00e441fd54f0f1f8cc9392ed319d9d16c0762' 
  AND token = 'Ie8t3GwnZyLasOJA8N42B3mHR0gWStgbmx1Ny4KAcsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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