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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e14a4b8b94b489d1ce8d3d8608f1802b979028b35a7537043b2faf56a42889b' 
  AND token = 'f2bH+5X+vvwgksPfirZJFB9brvucJ9ql6bXF5Dt2Lkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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