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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fb3693d4d7651ef31d607c050da3a7cdecc4f3bb068d5bc2f318e6eccb7af5' 
  AND token = 'xgiMiw7+0fYnR37m7K0xvuR8aQ0SBLFHyxuCHAvBcUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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