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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d6f071fd71812964f3176779b8bc80b12286c347043d155b7f59d6820638e7' 
  AND token = 'SgG9RZ+BTxl+BeJrEMf8lVkeo0l1GRmDTp7IunUdne4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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