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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b9fef6764843a82f2220e5ee66ada880bea675d65defe46821bce2de3cc6d5' 
  AND token = 'ATeFqQmHlbdhmy791ZNQuwcJDfnTPckxZGbI9eX4NXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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