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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b9407d6db854e560179790b48188f41ca56ad737dd2109bdc5c9ba0c364877' 
  AND token = 'HtN2ygBF03KTQv4HJG5Eqr2q7VWckl7iYMvKydDa27c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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