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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715f82bf8e48c8c4699c91dea5ad68f3ccd2f55a2c09fcfe4172d5b5a7b3934c' 
  AND token = 'Hee3bYcdegDn2oq66bbNbI2nkfEYtOHuzU/Ag+6leJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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