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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc425b67f8a9a57ff4e21a3240bf0f412da39b9b83ea8efc866c8e55c4c34e5' 
  AND token = 'e4fFIX/hoFKaoHjCJJQArUSkfBlblTsGNcb2A+2+G0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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