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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d5a09a75149e22cbc70604fdd98047554e9621776277a2ed3ab21254e3d73d' 
  AND token = 'lLodIPEfpaO0Z8C9RsPO79u0Ws1sAW8FxQ6C9iZ1sf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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