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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bf7b8c66e11f9d4ed83095706ea5eb2eef3e2b13e36fc42bf1e2f0b2468bac' 
  AND token = '7bXIbLpER1jYR8Dg+6XS4UyxAWNpu/Hlr9eefR1RvVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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