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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643c13141363b07ef697b75b57e7c1ce9146b4b1c4184c9f6323ecc001fa03c2' 
  AND token = 'bOruzQHq1AgAWiFYPUFM/neHtWqB6mJfbofuD+/Y95o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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