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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18964a897389cd8d3b15bd59fb986820a9cd292f834f3268eb149bc034ce3f59' 
  AND token = '0fN5CxMhahNB9sr0ltWlXN4eDd5Hdk4YyX5vJUIPTzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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