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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eef84d834403bf03c2e485c39a01263d988ff8939735f603a13c51db121c804' 
  AND token = '1FdiLTLJ5HbWua1soLp/3DjN52bLmcyhr4jZooNv85I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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