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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fc3e35f2cac2430e6c82770b6323528ed3f02e69553a2ead0dbf3d76aa20c4' 
  AND token = 'nmsGeJiyLVbC4vj4xM89ERDxBqirxugv9Jq+hK62Pns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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