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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c66a4016fe3a2265a69d2d72a7ae900cfb637551277a13bfcc6a8a2e71716d' 
  AND token = 'RVOcPdpTW+rHMzsOvEpXo0/t6JOjaRW/Fi9fuZEn+as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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