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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9c7ac2750a8277730cb5e278e7965a24ab3195b85c0f21cc411e7fcc7cd057' 
  AND token = 'lOiYvgNFeVH0wzUrS3sg8LVUzQXgADvldUTCXst2ixI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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