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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a71eb29d32ad4dbcf8c712cf681c3302ef409bc98bb742c1fcd1343432d8b00' 
  AND token = 'Xhxczaf4IDSG4iNXHGsJp3phYQyDtEAkqklsl75niYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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