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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d9419edd5134aa0b3d3fd541d5c5ad7dcd9e963ffdee265de19fe79425b4c7' 
  AND token = 'cYoPRuO0Y/DDYJleGRYZzkVrQ5l6Gxq3rzZHhDQH7bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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