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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927e57d3c7f3c714fc0ec80313c6437891f7e9c25a33bf59e862e86ca337683f' 
  AND token = 'uekzW7fa/omBl0s4ZF7so/JUQmTREz16zh8LtSvxrIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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