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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc3ce95a6c5ebba69fb510f562d2398d6b193c700436210fda6ced5e4474f35' 
  AND token = 'B7199dM+Tko/gxe0h0+/h0E7bjMlNhjBqmFe/ExGSr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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