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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29158a6a9af38875b111625154daf387d377d48f6813cf270ea0573cc2bc60ef' 
  AND token = '0ynQFH8hjE7UFwZ8duAt5HV7Dyl6dsNkiPXopT6ch84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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