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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6625c7f7736aafcb150ae5047537772e1fb381c241ab2fb2d64011f707ed7cc0' 
  AND token = 'OJc9l6rf3EvcT+QDGU1xfHwbuLFTUvh05BTlvCLGB7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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