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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3352c5aa6db065feaea88899ddd8096b58621befe6dae5a84543b39371feae81' 
  AND token = 'dM+qxelrNb57yi1l/9/NeSc1a2UNS1t/ZS/QxqDyAHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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