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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2c4153741b204baf9a44e9a13b3f8a583a66e1189fa27af9e1a24dc991dbf9' 
  AND token = '0BuQMVq8h6yuMiu3KG5Cp+Eo1rHcVSa5OfhGYIO7C+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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