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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636d11769072be98811dff6d73d1f6a1ff8f8756791faf58e69ee9b0305a8d4d' 
  AND token = 'a8+BdxgQT7gf+Sq3KzbCpBqg8TP25/ip0d25CFtHv28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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