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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c922f82642ca464d43bd3ca213f8b2dd3b501ec37348e4969130772061c498' 
  AND token = 'ajxL64dlmf4hPGQLNP10UNReTV5iU/fL3ptfCgQFPMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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