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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9525cd5b5d56e86c2b36d84c692f0db91186160fb74ac6a9de759f342ccc92' 
  AND token = 'dVFCpG57tLcQFaX9yiVSHQo6lU1t92u4r9NRhN3Hoq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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