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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af266461f7d3f19e506168d9a6e80b7fb02ea28834404044f840a7bae0d89326' 
  AND token = '/MIikIYU6OWQOE7Q16PfbT82yc99xt5IhEVx7qxwQ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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