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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc677e87cd1f0e651f4e6786d4820a948e86269c7a9a2b7e0294f44bd03b2a23' 
  AND token = 'iCpIVaDhxQ7Jabr1bvarMeJbPBq1lFvrRt7lZIUyX+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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