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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c1c2fd1e664f553ae3622235b6f204aaa525027574e7f742f6a62a3cab697c' 
  AND token = 'Wk6ksD6oqV0jmC13sIA4/9KYCf0sqOuxABG77Vy5om0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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