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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f18b09f629969f6f435df806e768e4b1dd43e78d186460ec5fe8026dedab4e' 
  AND token = 'hm1V8q9cCnVkpaLsh+8gVJMDMEOE3C0qwjk9hX1Z3lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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