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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb2a91f4951c12c741a3e34760124c9cc93af7b141bd969e5e9f2873f046c8b' 
  AND token = '8dRojCuG6DdDolPjL+/c6ouO0JFSIfSEZb0U019Uf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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