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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28370c6637add9310a5fd285829571480f0093d14a9d1253b27d75c751b59ed' 
  AND token = 'qTyLB61hZfsk9/TcrVV/oSQo7qwoXJIdOQif/5EqJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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