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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064badaa0538310d1a2f206d3c3b75d9f2976c72e989ce09cd0460f4c3fcde80' 
  AND token = 'm/rb1dxqXn0PDuYR2j7aYz8/QU9UbTQiQjyuu29iJpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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