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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238252e2b349ea9b58c2f228a06334d56405580a859d4e9234045a1a5433a33b' 
  AND token = '5Cc6hUREmrty3wbYJobZ6yzrbwM22Me/QP1DZtqLWpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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