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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a7962d0d43a7149052fe98ad27b6b8e76932068ffaaf8c771bbe9ac3723ff8' 
  AND token = 'rXiTMAbtq1D9l46EjcoZmTVAJqpkhMw/UbJN+6e6nA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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