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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd873b99cdec24a97032e30f80927dee1476348f7c3a1fdd90be05a8f3f9b1e' 
  AND token = '9xFYQaxcJXAt4l5m8BaYdxqSIP52CLvdp9eGx8QLRkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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