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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39acc16b277974c43f30742719f992a34532c0bb5fbeb2fadc8904d612797695' 
  AND token = '1ytkbrSb5RIuLxuvywoj1+CTTWghTjldbj3l4ssjJuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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