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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5760852341c7c913664b25e42c9193149333fc9cadde4b5db7c17ae852f63f9c' 
  AND token = 'M97N/Ka7dAvYaTnv6qBUFDrywyiHERp4GGeZiV6kqnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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