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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0ef3c54d7e534829a541939166e24e891c898a887be7105eaf9090ba2b66da' 
  AND token = 'LBXs95NG8ffS5D5kuaD+7SsDIdUE5z2StuvJSYaSGpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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