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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e385e34db2981fb2d3527735448965af4a0c0b1de3e175a411bff47c9f911fc8' 
  AND token = 'IR9cm/d0mws2WaC6/Bmnk7fKjZIHtshutZhkHPMeXqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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