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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71c8531c3670379e9aeb84c3e3f107e5a3c3a2e2fe5ccbf17b5cab0f0d8671e' 
  AND token = 'SOKyiinNGrirOPo9YuKah3Ua3YH/JKS65a3VbnqOju0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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