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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd2b71f6e15427bea15810684c11a552b6c529d5821f1ea472c246a1d603efe' 
  AND token = 'vrMLvJgnVhxFAmyBn16+G1EN2bK503ms19pPzGFa0K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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