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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52e1cc9a5e2abb65a00d18826f286850953c898b0b048176f13d09201f8efbc' 
  AND token = 'GZaBqFFIP1VUJZJdWWSIj/+jv+Hmcc4bkI4eptxFK68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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