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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ff402d3ae8a78c86efe257df1116b76262ec60d86fdb4fce11bfb0770ea3dd' 
  AND token = '8T1GJjMjh37VCyak3KjskujP1L2cAxdvE5OxHdZmIOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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