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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40090e307ef29718b96e0dc3750a4c91311547a96b7b5b2c158ca602601b7c60' 
  AND token = 'USjwPf5lDDRDcAwqS/IhhoxJXtGhww37dDrMC4a10o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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