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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071b7de111904ecac4b43c001a2ca7edea256e2207d4f7b893ad7c8cb2effdcb' 
  AND token = '9FWaBunRWPDbQY2My6ewx1EtIhULSETqxcCF1/lw4wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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