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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70960e28098845f0b83b8d6199b19787b55059f6f521a2f35fd2f74ec4bea92' 
  AND token = 'c0V1fpD/ThprR//cZr6ELRiV+6Gm/nY1kZPWz5cxRCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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