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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d3fcd83b71dbf174f29124bd2abac27965ab83857f28bd7415432a7ff29216' 
  AND token = '712V9+5PBsmy/vpnPGyKxDZbnMKRSDSbNAoodoPwEdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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