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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25260753865376097856eb9ddba461b356043065bd0600c8815e4b7d1c931819' 
  AND token = 'IEo/uah+TtEz6m3/eqVAwvZXMbUbzX8E6aFUvQpa2qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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