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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76036168ee8c4db0d152f1f123d12769e89e393f0ff8d209513dbd874a2c3f3' 
  AND token = 'NKm/PB6k5nEm384kL1L9p11I39bapUKdd80ix9q2I0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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