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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948a874db09e38b1bb10a00374221e81d0e64ebdee40b6ae5a97d16454fe2b6f' 
  AND token = 'kJW/Q/ksl2BS0YqiOyec+n36fcICzTK1jlLrgiPzRQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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