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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5959621dd669403d378cc31198dbd0e55058c1db1b9bd05fdfa84133e77c3fa4' 
  AND token = '77biKVp1d6n7PWgcqhRNCHSJ+3bRZi6a+9Usybf5hEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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